Fabric-cutting machine.



H. MAIMIN.

FABRIC CUTTING MACHINE. APPLICATION FILED JUNE I8. 1915.

Patented J 11116 6, 1916 WITNESSES.-

HYMAN' Mariam, or nEwronK, N. Y.

FABRIC-.GUTTING MACHINE.

To aZZ whom it may concern: 7

Be, it known that I, HYMAN'MAIMIN, a. citizen of'the United States, and 'a resident of New York city, in the county of New York and State of New York, have invented certain new and useful Improvements in Fabric-Cutting Machines, of which the following is a specification. I

My invention relates to improvements in fabric cutting machines. of the type employing a verticallyreciprocating knife sliding in a standard,'which supports the driving de-v vice, usually an electric motor, and the par ticular mechanism for actuating the knife,

together with a protecting guard and presserfoot guide mounted in front of: the cutting edge of the knife and capable of a vertically adjustable movement for the purpose of bringing the presser-foot into contact with the top layer of fabric to be cut. The knife is a long fiat blade of steel sliding freely in a groove in the forward edge of i the standard from which it projects for about one half of its width. .It has two cutting edges, the front and the lower. The front edge is known, among those skilled in the art, as the right edge, because an edge of this character is required for cutting which it does with a saw-like-motion, as it is pressed against the layers of fabric. This edge is sharpened by the operator by first moving the knife guard out of the way and then by: using an emery stick similar to the scythe ,rifle, and drawing this emery stick downward alternately along each side of the knife at an angle to form the edge.- The lower knife edge which is knownas the razor'edge, because in cutting this edge has the action of a chisel and requires to be extremely sharp, is sharpened by being first removed from the machine and then whetted or honed on a. fine grained stone or abrasive device similar to that used for razors.

The objects of my invention are, first to provide a reciprocating knife fabric cutting machine in which the lower or razor knife edge maybe sharpened without removingthe blade from the machine; second to provide a sharpeningdevice for accomplishing this that willproduce a uniform edge of the character required for the correct operation.

of the machine and third that will save the time necessary for the removal andreplace ment of the cutting blade.

The several objects of my invention asset forth above and the particular methods. of-v Specification of Letters Patent.

the operating means for actuating the sharp-' if enlng device. I a a against the bottom of the slot 6. In front? partially inside of the forward edge 13 of the'1'95 I avoid the necessity of removing the knife? driving mechanism in relation to the stander .ard consists of a lunge portion 14/ securedto 'cated a cam 17 having faces 18 and 19 shaped .similarly to and adapted to co-act with them Patented June 6, 1916.

Application filed June 18, 1915. Serial No. 34,874. E H 5" obtaining these are .now to be described and are-illustrated in the accompanying draw'-- ings forming part of this specification. Similar characters of reference denote like" or corresponding parts throughout the sev-" eral views of which i v I 5;,

Figure 1 is a partial side elevation of a cutting machine of the character described showing my invention; Fig. 2. is a. partial rear elevation of the same machine and Fig; 3 is a partial section and front elevation of Referring particularly -to- Fig; .1 ofthe drawings numeral 1 is the base plate or foot-: plate of the cutting machine. Rising from this plate and securedthereto is the standard"? 2 the upper portion 3 of which forms a sup'- port and guideway into which fits the loweri; portion 4 of the housing supporting the electric motor 5-and actuating mechanism of the J= cutting machine. The standard 2 is slotted:

at its forward edge to a depth corresponding i to line 6 and sliding in this slot is a knife 7 so the back edge 8 of which normally bears? of this knife and for the purpose of protect-"r mg the operator is a guard 9 secured to the front' ofthe motor housing and 'capable'of..'85 vertical adjustment for the purpose of bring- 1 ing the presser-foot and patternguide 10 into contact with the upper layer of fabric to be cut. The forward cutting edge 11 of the knife 7 requires a rather rough or sawe' like edge for cutting andthisis'obtainedi with the use of the emery stick in the man.-? ner as described. The lower edge 12 of the knife 7 when this knife is cutting, extends standard so that ordinarily-the knife has'togf be removed from the standard for sharpen- 11 ing this edge; however, with my invention? by moving the entire driving mechanism and .100 knife mounting forward in relation tothei standard so as to bring .the entire lower cut ting edge 19. beyond the forward edge 13 o the standard 2 and thus expose the edge 12'. for sharpening purposes. The means by which I move the motor an the base 4 and having helical faced cam sur-v faces 15 and 16 betweencwhich faces is 101 1110 through the pin the sidev of the knife position for grinding either faces and 16 respectively. Cam 17 is held in alinement with part 14 by a pin 20' which permits of a swinging rotation of the cam. 17 and of the arm 21 preferably formed integral with 1?. Cam 17 carries at its central portion a projecting collar 22 which en gages in a slot 23 of the upper portion 3 of the standard 2 and serves the purpose of preventing a relative movement between the cam 1'? and the standard in the direction of the axis of the pin 20. If the arm 21 is rotated from theposition shown in'Figs. l and in a counter-clockwise direction through 180 it will assume the position 2% shown. dotted in Fig. 2 and in this rotation will slide the motorframe 4' backward in reference to the standard and will bring the back edge 8 of the knife 7 into contact with the bottom of the slot 6.

The arm 21 carries in a forkedend 25, 2? a short arm 26 capable of moving backward against spring 28 which bears against a projection 29 of a member 31 secured to arm 26. This arm 26 is restricted in its forward movementby the projection coming into contact with finger 30 secured to arm 21. At the lower end of arm 26 is secured two members 31' and 32. Between these members is pivoted at 33 a frame 34 capable of oscillation transversely and at right angles to the plane of movement of arm 26. Journaled in frame 34. at is a shaft 36 secured to one end 'of which is a crank 37 having a handle 38 by which the shaft may be rotated. The other end of the shaft 36 carries a heart shaped. cam 39 adapted to operate between-the sides of the fork 40 formed at the lower end of membc This cam upon its rotation causes the frame 3. to swing through the are C D, having about equal periods of movement and rest (hiring one rotation of the shaft; that is, the frame moves from. D to C during about 90 rotation of the shaft 36 then remains at rest during the next quarter turn then moves from C back to D during the third quarter period and remains at rest during the fourth quarter period back to. the first position. mentioned.

At the lower end of the frame 34 are projecting pins 41 and 4:2. The aXis of each of these pins is at right angles to the plane of edge 12 on the same side when the frame 34 is in the operativeknife face. Mounted on these pins 41 and42, so as to oscillate thereon, are spools 43 and 44 held on "their respectivepins by collars i5 and 46.; Secured to these spools and extending forward I are arms 47 and 48 carrying mounted on theirends and capable of oscilation thereon holders .49'and 150 to which the grinder stones 51 and 52 are secured by any of the well known methods. The, holders bear against collars 5 3 and 54' and forked end 66.0f lever 61.

are held on the arms .47 and 48 and rotated toward each other by the springs 55 a. d 56. This rotation however is limited by shoulders 57, 57 against which similar shoulders 59 and 60 on the holders are adapted to engagerespecti ely. The arms 47 and 48 are oppositely reciprocated by a forked lever 61 pivoted to frame 34% at 62 and having forked ends 63 and, 64 engaging the arms 47 and 48 respectively. The lever 61 is oscillated back .and forward through the rotation of a heart shaped cam 65 secured to shaft 36 and engaging the so timed in relation to the cam 39 that it serves to oscillate the lever61 during those periods when the frame 34 is at rest on lines 0 or D... The cam. 65 is further timed to commence an upward movement of arm 47 when the frame 34 has been-swung to line D and the grinder stone 51 is inspring con.- tact-witb. the face of edge 12 thus producing by the upward-and outward. slidin contact of the grinder stone Wltlll-llf) edge 12 the correct grinding action. While stone 51 was moving-upward in contactwith kni-fe edge 12, stone 52 was moving downward and out of contact with the opposite face of edge 12 tation. of the handle after stone 52 reaches its lowest position of travel, the frame M will swing to position C, thereby bringing stone 52 into contact with the knife edge 12. For holding the arm 26 in alinement with.

the standard. ro'ectin fin ers 67 '67 are secured to member 32. These fingers engage opposite sides of the standard when the arm 26 and frame 34: are swung from position. li to position B, at which time the stones 51 and move past the standard, one on either side ofisame, into their operative position as shown in Fig. 1. After the knife edge has been sharpened iii the manner descriied, the frame 34 carrying the sharpening mechanism is moved to posl tion B and then the entire sharpening de vice is rotated to the position 2i where it is held out of the way by the spring catches 68 and 69.. This upward swinging movement to position 24; retracts the knife into the standard and leaves the machine in normal operative position.

In various ways the details of construction may be modified without departing from the principle involved; the stones may be moved downwardly in contact with theknife edge and different mechanism may be used to accomplish the opposite reciprocation of these stones. Also other cam The cam 65 is.

and upon the continued romovement between the knife and the stand-- ard so as to expose the lower edge of the knife for sharpening.

2. In a reciprocating knife fabric cutting machine, means for advancing the knife in the standard to expose the lower cutting edge of the knife for sharpening.

3. In a reciprocating knife fabric cutting machine, means for advancing the knife parallel to its operative position in the standard to expose the lower cutting edge of the knife for sharpening.

4. In a reciprocating knife fabric cutting machine, means for advancing the knife partially from the standard so as to expose the lower edge of the knife for sharpening.

5. In a cutting machine of the character described, means for producing a relative movement between the driving, driven, cutting and protecting elements and the standard to permit of the sharpening of the lower edge of the knife.

- 6. In a cutting machine of the character described, means for advancing the driving, driven, cutting and protecting elements in relation to the standard for exposing the lower edge of the cutting element for sharpening.

7. In a cutting machine of the character described, means for moving the elements supported by the standard in relation to their support for exposing the lower edge of the cutting element to enable the same to be sharpened;

,8. In a cutting machine of the character described, means for advancing the elements supported by the standard in relation to their support for exposing the lower edge of the cutting element to enable the same to be sharpened.

9. In a cutting machine of the character described, meansfor sliding forward the elements supported by the standard in relation to their support for exposing the lower edge of the cutting element to'enable the same to be sharpened.

10. In a cutting machine of the character described, means for advancing the knife in the standard to expose the lower cutting edge of the same and sharpening means comprising two abrasive elements adapted to be brought into their operative position,

one on either side of the standard from the back edge of same, for sharpening the lower edge of the knife.

11. In a cutting machine of the character described, means for advancing the knife in the standard to expose the lower cutting edge of the same and sharpening means comprising abrasive elements adapted to be brought alternately into sliding contact with the opposite sides of thelower edge of the knife for the purpose mentioned.

12. In a cutting machine of the character described, means for advancing the knife in the standard to expose the lower cutting edge of the same and sharpening means comprising reciprocating abrasive elements adapted to be brought alternately into sliding contact with the opposite sides of the lower edge of the knife for sharpening same.

13. In a cutting machine of the character described, means for advancing the knifein the standard to expose the lower cutting edge of same and sharpening means comprising reciprocating abrasive elements adapted to be brought alternately into slidmg contact with the opposite sides of the lower edge of the knife during their upward movement for sharpening same.

let. A reciprocating knife fabric cutting machine comprising a base, a standard mounted on the standard and adapted to' be advanced in relation thereto by means connected with an arm swinging downwardly to a position back of the standard and in line therewith, sharpening means mounted on the arm comprising two reciprocating abrasive'elements capable of forward movement into their operative position, one on either side of the standard, for sharpening the lower edge of the knife by an alternate sliding contact with opposite sides of its edge.

Signedat New York city in the county of New York and day of'June A. D..1915.

HYMAN MAIMIN.

l/Vitnesses THOMAS VnrroH, BERNARD SACKS.

State o'fNew York this 17th 

